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S13 Integridade Estrutural |
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Title:
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A FRAMEWORK TO CORRELATE EFFECTS OF CONSTRAINT LOSS AND DUCTILE TEARING ON FRACTURE TOUGHNESS - PART II: FRACTURE UNDER SMALL SCALE YIELDING CONDITIONS
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Summary :
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THE CHARACTERIZATION OF FRACTURE RESISTANCE USING SMALL SCALE YIELDING (SSY) SOLUTIONS COUPLED WITH A MICROMECHANICS MODEL FOR CLEAVAGE FRACTURE BASED UPON THE WEIBULL STRESS IS THE FOCUS OF THIS PAPER. A COMPUTATIONAL MODEL EMPLOYING A MODIFIED BOUNDARY LAYER (MBL) FORMULATION IS EMPLOYED TO GENERATE NUMERICAL SOLUTIONS FOR THE CRACK-TIP STRESS FIELDS OF CRACKED BODY WITH WELL-
CONTAINED PLASTICITY NEAR THE CRACK TIP. ONE KEY FEATURE OF OUR INVESTIGATION IS THE GENERATION OF CRACK-TIP FIELDS DIFFERING IN STRESS TRIAXIALITY BY VARYING THE NON-SINGULAR STRESS, T, PARALLEL TO THE CRACK PLANE. THIS INTRODUCES THE NOTION OF REFERENCE FIELDS TO PROVIDE A MEASURE OF
CONSTRAINT LOSS WHEN LARGE SCALE YIELDING (LSY) EFFECTS ARISE IN FINITE BODIES. ANOTHER FEATURE OF THE PRESENT INVESTIGATION IS THE REALISTIC MODELING OF DUCTILE TEARING AND ITS IMPLICATIONS ON THE (MACROSCOPIC) FRACTURE RESISTANCE BEHAVIOR. THE WEIBULL STRESS TRAJECTORIES UNDER SMALL SCALE
YIELDING ANALYSES WITH VARYING LEVELS OF T-STRESS PROVIDE VALUABLE INSIGHT ABOUT THE EFFECTS OF CRACK-TIP CONSTRAINT AND DUCTILE TEARING ON FRACTURE RESISTANCE. |
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Author :
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Ruggieri, Claudio 0
Trovato, Euclydes 0
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Paper View :
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